{
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\begin{tabular}{l*{1}{c}}
\toprule
                &\multicolumn{1}{c}{Effective campaign (z)}\\\cmidrule(lr){2-2}
                &\multicolumn{1}{c}{(1)}\\
\midrule
\textbf{Panel A: Main effects} &         \\
                &         \\
Any voice treatment&   -0.072\\
                &  (0.068)\\
                &         \\
\hline          &         \\
\textbf{Panel B: Type of voice} \\ &         \\
 Instrumental   &   -0.084\\
                &  (0.076)\\
                &         \\
Intrinsic       &   -0.060\\
                &  (0.080)\\
                &         \\
\hline p(Instrumental = Intrinsic)&     0.76\\
 \hline         &         \\
\textbf{Panel C: Feedback announcement} \\ &         \\
                &         \\
Feedback announcement&   -0.074\\
                &  (0.080)\\
                &         \\
No feedback announcement&   -0.071\\
                &  (0.077)\\
                &         \\
\hline p(Feedback = No feedback)&     0.97\\
 \hline Control mean&     0.00\\
Number of Observations&      955\\
\bottomrule
\end{tabular}
}
